Officials from Manhattan and Brooklyn want to see what life will be like during the L train shutdown — way before the tunnel closes for repairs.

In a letter to MTA and DOT, state Sen. Brian Kavanagh and 16 other lawmakers said the agencies should be running extra buses in new lanes, starting HOV restrictions and changing traffic flows several weeks before the Canarsie tunnel closes in April 2019.

Here’s a battle we need to keep fighting. Rush hours are not acceptable. Maybe a break over night but not mid-day.

* De Blasio rejected a plan favored by L train commuters that would have banned private cars and only allowed buses to use much of 14th Street all day when the L train shuts down for 15 months, instead approving the ban only during rush hour, the Daily News reports.